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The objective of this work is to design and construct two prototypes of a gas-liquid absorber containing an integrated heat exchanger, intended to perform highly endo- and exo-thermic absorptions/reactions with high efficiency. This is a new technique for an absorber-reactor, in which the absorbent liquid passes through a macro-porous metallic matrix, being an excellent heat conductor, in close contact with the flattened tubes in which the heat carrier fluid flows, so transferring the extracted heat. A first gas-liquid absorber prototype has been constructed. It consists of a vertical cylindrical column in which a bundle of hollow vertical fins is placed. A heat carrier fluid flows throughout these fins in order to extract the reaction heat. Porous packings made of corrugated or extended perforated metal sheets are inserted between the fins. A liquid distributor on top of the column sprinkles the porous packing uniformly with the absorbing liquid. This presents a compact ensemble in which the heat exchanger is integrated within the gas-liquid reactor. The second prototype is made of a set of parallelipipedic units (that can be dismounted) used alternately for the heat carrier liquid and the absorbent solution. These units are separated by thin metal sheets which transfer the heat. 150 porous matrices have been tested. They have heat transfer coefficients, between the wall and the falling solution, of about 10 to 15 kW/m2 and coefficients of about 2kW/m2 between the liquid/vapour absorbent interface and the heat carrier fluid body.

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Authors: LEGOFF P, CRIFIC, Génie des Procédés, Nancy (FR)
Bibliographic Reference: EUR 12464 FR (1990) 91 pp., MF, ECU 4, blow-up copy ECU 12.50
Availability: (2)
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